TEXTURE_TOOL=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/texturetool

$TEXTURE_TOOL -m -e PVRTC --bits-per-pixel-4 -o "seasons_m_4bpp.pvr" -f PVR "seasons.png" -p "seasons_m4bpp_prev.png"
$TEXTURE_TOOL -m -e PVRTC --bits-per-pixel-2 -o "seasons_m_2bpp.pvr" -f PVR "seasons.png" -p "seasons_m2bpp_prev.png"

$TEXTURE_TOOL -e PVRTC --bits-per-pixel-4 -o "seasons_4bpp.pvr" -f PVR "seasons.png" -p "seasons_4bpp_prev.png"
$TEXTURE_TOOL -e PVRTC --bits-per-pixel-2 -o "seasons_2bpp.pvr" -f PVR "seasons.png" -p "seasons_2bpp_prev.png"